79 
1077 Spheerium striatinum Lamarck. 
Connecticut to Alabama; California. Montana. 
1078 Sphezrium sulcatum Lamarck. 
Maine to Alabama and California. 
1079 Spherium tumidum Baird. 
Sumass river, latitude 49 deg., Washington. 
1080 Stenotrema germana Gould. 
Vancouver Island to Western Oregon. 
1081 Succinea hawkinsii Baird. 
Tryon, Mong TM 28, t 2 f 31. 
Very narrow, sub-cylindrical, thin, rugosely striate; spire 
very short, apex mamillary; whorls 2%, suture not impressed; 
body very long and narrow, the sides flattened, sub-parallel; aper- 
ture narrow ovate, two-thirds the total length, viewed from the 
base exhibiting the interior of the whorl to the apex, columella 
slightly folded above, with a callous deposit. Covered with a 
rather oblique dark yellow or orange epidermis. Length 1; 
diameter 5 mm. 
Living: Washington; British Columbia. 
1082 Succinea Nuttalliana Lea. 
Tryon, Mong T M 26, t2 f 26. 
Ovate conic, very thin, pellucid, shining, striate; spire acute, 
attenuate; whorls revolving very obliquely; aperture two-thirds 
the total length, ovate, broadly rounded below, angled above; 
columella without fold. Light horn color or greyish. Length 15, 
diameter 8 mm. 
Living: Snake river, Oregon, to Clear Lake, California. 
1083 Succinea oregonensis Lea. 
Tryon, Monog T M 28, t 2 f 18. 
Elongated oval, thin, diaphanous, shining, striate; spire acute, 
suture well impressed; whorls 3, well rounded; body _§ seven- 
eighths and aperture two-thirds the total length; aperture ovate, 
one-third longer than broad, columella arcuate. Color deep or- 
ange or golden. Length 9, diameter 6 mm. 
Living: Vancouver Island to Baja California. 
1084 Succinea lineata W. G. Binney. 
Tryon, Monog T M 238, t2 f 16. 
Oblong ovate, irregularly wrinkled, between which are coarse, 
remote, revolving lines; spire acute; whorls 3, very convex; aper- 
ture % the length of the shell, oval; columella folded. Length 
12, diameter 6 mm, 
Living: Nebraska; British Columbia; northeastern California; 
Utah. 
1085 Succinea sillimani Bland. 
Tryon, Monog T M 24-25, t 2 f 21. 
Oblong-ovate; thin, coarsely striate, shining; spire short,acute, 
suture impressed; whorls 3, convex, much flattened superiorly; 
aperture oblique, elongate oval, angular above, effuse at base, 
columella slightly arcuate, with a thread-like thickening above. 
White? Length 20, diameter 8.5 mm. 
Living: Humboldt Sink, Nevada, to San Joaquin Valley, Cal- 
ifornia; Washington. 
1886 Succinea stretchiana Bland. 
Tryon, Monog TM 19,t 2 f 5. 
Globose-conic, thin, pellucid, shining, striatulate; spire short, 
obtuse, suture well impressed; whorls 3, convex, last inflated; 
aperture roundly oval, columella arcuate, slightly thickened. 
Greenish horn color. Length 6.25, diameter 5 mm. 
Sub-alpine Sierra Nevada, California and Nevada, 4,000 to 
6,500 feet altitude. 
